Question

The paramagnetic behaviour of `B_2` is due to the presence of
A. 2 unpaired electron in `pi_b` MO
B. 2 unpaired electrons in `pi^**` MO
C. 2 unpaired electrons in `sigma^**`MO
D. 2 unpaired electrons in `sigma_b` MO.

Answer 1

Correct Answer - C
Electronic configuration of `B_2` is `sigma_(1s)^2 sigma_(1s)^(2**) sigma_2^2 sigma_(2s)^(2**) pi_(2px)^(-) pi_(2py)^(1)`